Beautiful !
Sorry but I havn’t read all comments : It’s a left handed guitar ?
For more realistics close up, you can up a little bit the the first and fourth pegs (where are attached strings).
You can add a point on the third fret too 
yes its a lefty! (he said so in his first post). i think on your render, doncrone, the light comes in and out way to harshly, ie very harsh light. hdri is ok, but i dont really see how it relates to guitars, and why there are cracked walls going up. why not get rid of the hdri? the guitar is cool enough 
Nice model!
The reflections in the last one look a bit off to me though. Also the ground texture seems to be dripping downwards like it was a vertical wall so I’d probably change that. Overall it’s a nice guitar, reminds me a lot of one I made a couple of years ago.
so here is my 2 cents worth. I like it. I have a Yamaha FG 110 that is about 40 years old. I do think the gloss could be reduced on the last render. I looked at the shot on your site and it is superior.